diff options
Diffstat (limited to 'pdf/draw_utils.cc')
| -rw-r--r-- | pdf/draw_utils.cc | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/pdf/draw_utils.cc b/pdf/draw_utils.cc index 7f999f0..d38be52 100644 --- a/pdf/draw_utils.cc +++ b/pdf/draw_utils.cc @@ -57,9 +57,16 @@ inline bool ImageDataContainsRect(const pp::ImageData& image_data, pp::Rect(image_data.size()).Contains(rect); } -bool AlphaBlend(const pp::ImageData& src, const pp::Rect& src_rc, +void AlphaBlend(const pp::ImageData& src, const pp::Rect& src_rc, pp::ImageData* dest, const pp::Point& dest_origin, uint8 alpha_adjustment) { + if (src_rc.IsEmpty() || !ImageDataContainsRect(src, src_rc)) + return; + + pp::Rect dest_rc(dest_origin, src_rc.size()); + if (dest_rc.IsEmpty() || !ImageDataContainsRect(*dest, dest_rc)) + return; + const uint32_t* src_origin_pixel = src.GetAddr32(src_rc.point()); uint32_t* dest_origin_pixel = dest->GetAddr32(dest_origin); @@ -86,7 +93,6 @@ bool AlphaBlend(const pp::ImageData& src, const pp::Rect& src_rc, dest_origin_pixel = reinterpret_cast<uint32_t*>( reinterpret_cast<char*>(dest_origin_pixel) + dest->stride()); } - return true; } void GradientFill(pp::ImageData* image, const pp::Rect& rc, |